Material discharge gun



Aug.l7, 1934. w. PVCARR ErAL 1,969,205

MATERIAL DISCHARGE GUN l Filed Sept. 6, 1952. v 2 Sheets-Sheet l l ,I I,I I,

"I i weer. y

Aug. 7, 1934. w. P. CARR ET AL lMATERIAL DISCHARGE GUN Filed Sept. 6,1932 2 Sheets-Sheet 2 i.; mail! Patented Aug. 7, 1934 UNITED vSTATES1,969,205 MATERIAL DISCHARGE GUN william P. can and wbert w. Tracy,Toledo, Ohio, assignors to The De `Vilhiss Company, Toledo, Ohio, acorporation of Ohio Application September 6, 1932, Serial No. 631,873

24 Claims.

This invention relates to guns for discharging materials of a fluid orsemifluid nature, and particularly to air brushes of the type adaptedfor spraying surface coating materials such as paints, lacquers,varnishes, etc., and has for its primaryobject the provision of certainimprovements on devices of thisv character, whereby to enhance thepracticabilityand commercial value thereof.

In this type of device, the air and material control valves are eachspring-pressed to normally retain them closed, and the operator inactuating the trigger member to open these valves and then to maintainthem open is required to oppose and overcome the closing pressure of thesprings, which for prolonged spraying, in particular, becomes verytiring.

An important object of the present invention is the provision of meanswhich is automatically operable upon an initial movement of the trig-Ager member to vrelieve to a considerable extent the valve-closingpressure on said member, thus reducing to a minimum the tiring effect onthe operator of holding the trigger member in open or operatingposition,

Other objects of the vehicle will be apparent from the followingdetailed description, and from the accompanyingl drawings illustratingthe same, in whichl Figure 1 is a side elevation of a gun embodying theinvention with the operating parts in normal closed position and withparts broken away. Fig. 2 is an'enlarged fragmentary sectional detail ofthe fluid-operating means for partially relieving the closing pressureon the material valve when the trigger member is operated. Fig. 3 is a)side elevation of the unit embodying the closing means for the materialvalve with the unit, removed from the gun. Figs. 4 and 5 arecross-sections taken respectively on the lines 4-4 and 5-5 in Fig. 2.Fig. 6 is a view similar to Fig. 2 of a diierent form of automaticpressure relieving means for the material valve. Fig. 'l is afragmentary elevation of the gun with the spray head unit partiallyremoved from the stock unit-and showing the trigger member and itsmaterial valve engaging dog in released position with respect to suchvalve. Fig. 8 is a cross-section on the line 8 8 in Fig. 1 illustratingthe trigger dog in operating connection with the material valve, andFig. 9 is a fragmentary section on the line 9-9"in Fig. '1.

Referring to the drawings, A designates the stock unit, and B thespray-head unit of a spray head rmly to its seat against the stock by aturning of the tubular screw member 6 into threading engagement atitslforward end with the head. The tube 6 communicates at its forwardend with the customary air discharge passages of the spray-head and atits rear end, as hereinafter described, with a source of air pressuresupply with which the gun is connected. I'he rear end of the tube 6projects from the rear end of the bore 5 and is provided with anenlargement which seats against the end wall of the bore to close it andis adopted to be engaged by a turning tool.

The spray head carries the customary material control valve '7, the stem8 of which projects rearwardly through and from the body shank 4 inposition to beV engaged by the trigger member 9 of the gun. The member 9has its upper end forked and'straddling the stock body 1 and pivotallyconnected thereto by a screw 10'. The trigger 9 carries a dog 11 betweenits fork arms and below the body' of the stock 1 and is adapted tostraddle the valve stem 8 and to engage an enlargement or shoulderedportion 12 thereon to effect a retraction of the valve stem from normalor closed position when the trigger is drawn rearwardly from its normalposition, as shown in Fig. 1.

The dog 11 is of U-form, being of a width to substantiallyv span thespace between the fork arms of the trigger 9, and its legs have pivotstuds 13 projecting outwardly therefrom and pivotally engagingrtherespective fork arms of the trigger, with the axis of the studs parallelto the trigger axis 10 and in substantially the line of opening pull oftheA dog on-the valve' stern.y The web portion of the dog is centrallyslotted from its bottom side upwardly to adapt the dog to straddle thevalve stem 8, and the upper edge of such web is provided atl its endswith ears 14, which coact with circular recesses 15 in the respectivelower side edges of thev stock body to effect a camming or throwing ofthe dog to horizontal stem-released position, as shown in Fig. '7,

when the trigger has been swung forward a predetermined extent, whichlatter is preferably only permissible when the spray-head unit B hasbeen moved forwardly a short distance from its assembled position withrespect to the stockbody. It is apparent that when the trigger is swungforward from its normal position, as shown in Fig. 1, the curved wallsof the recesses 15 will have camming coaction with the ears 14 of thedog to effect a swinging of the dog to horizontal or released positionwith respect to the enlarged portion 1 of the valve stem.

The primary purpose of providing this manner of engagement of thetrigger with the valve stem is to enable the raising of the fulcrumpoint of the trigger with respect to the valve stem with which itcooperates, so that the trigger, during its operating movements inengagement with the valve stem, will have a more direct thrustthereagainst and will thereby lessen to a minimum the frictionalwear-producing sliding coaction of the trigger in engagement with thevalve stem.

'I'he yielding closing means for the material valve 7 is mounted in abore 16 provided through the upper end portion of the handle 3immediately belowthe body portion 1 of the stock, and is in axialalignment with the valve stem. Both ends of this bore are open. In thepresent instance, the valve-closing means and the tension adjustmenttherefor comprises a unit C, shown in Fig. 3 as separated from the gun,and including a body shell 17, which is inserted in the bore 16 andretained therein by threading, as shown at 18.

'I'he shell 17 forms a cylinder 19, which has its inner end open to theinterior of the bore 16 through ports 20 and is provided at such endwith a reduced shank or extension part 21 having an axial openingtherethrough for a piston stem 22 and including a packing gland 23 forsaid'stem. The shank 21 seats in and closes the forward end of the bore16.

A piston 24 is mounted in the cylinder 19 and attached to the respectiveend of the stem 22, and the opposite end of such stem is adapted to bearagainst the rear end oi' the valve stem enlargement 12 when tne sprayhead unit B and the control unit C are in assembled relation to thestock unit A, as shown in Fig. 1.

The outer end of the cylinder 19 is closed by a suitable closure means,which, in the present instance, is of two-part construction andcomprises the collar 25 and the plug member 26, which is rotatablymounted in the collar 25 and prevented from axial movements relativethereto by an anchoring ring 27 mounted in cooperating circumferentialrecesses in the two members. The collar 25 has threaded engagement withthe outer end of the shell 17, as shown at 28, and has a portionprovided with a wrench-engaging sury face I29 to facilitate turning ofthe collar into form engagement with the shell. The shell 17 alsolpreferably has a wrench-engaging surface 30 to facilitate a iirmturning of the shell into engagement with the wall of the bore 16 inwhich inserted.

A compression spring 31 is disposed in the cylinder 19 with one endbearing against the rear side of the piston 24 and with its opposite endencircling a sleeve 32 and bearing against the shouldered or enlargedrear end portion of such sleeve, which has its outer or rear end thrustagainst the inner end of the closure member 26. The'enlarged end portionof the sleeve 32 projects the collar 25 and is prevented from turningrelative to said collar by a pin 33 projecting from one into a.registering slot 34 in the other.

A second stem or pressure rod 35 extends entirely through the stem 22and piston 24 axially thereof, the piston and its stem being hollow forsuch purpose, and itsforward end is adapted to bear against the valvestem enlargement l2 while its rear end is provided at the rear of thepiston with a shoulder 36 for receiving the thrust of a coiledcompression spring 37 that is of considerably less tension than thespring 31. The spring 37 extends into a cylindrical plug 38, and has itsrear end thrust against an internal shoulder or flange at the rear endof such plug. The plug 38 is threaded in the sleeve 32 and has its rearend tting into the cup or hollow of the closure member 26 for turningmovements therewith and free axial sliding movements relative thereto,whereby a turning of the member 26 relative to the member 25 will impartaxial adjusting movements to the plug 38 due to its turning in threadedengagement with the sleeve 32. The forward end of the plug 38 acts as astop for the rearward movements of the plunger 24, thus limiting theopening -movements of the material valve. Such opening movement may bevaried by an adjustment of theplug 38. A vent 39 is provided in theclosure member 26, so as to place the adacent end of the cylinder 19 incommunication with the atmosphere.

'Ihe handle 3 has an air pressure supply passage 40 therein adapted tobe connected at its lower end to a hose or other conduit incommunication with a source of air pressure supply and opening at itsupper end into a valve chamber 41 in the upper portion of the handle-below the bore 16 which receives the valve-control unit C. The chamber41 has an outlet 42 opening into the forward end portion of the`bore 16at a side of the reduced shank portion 21 of the control unit shell, andair admitted to such bore is adapted to enter the forward end of thecylinder 19 in advance of the piston 24 and also to pass from said borethrough a port 43 into a longitudinally extending passage in the stockbody 1, which passage communicates at its forward end with theairdischarge passages of the spray-head, as well understood in the art.In the present instance, the screw 6 which ties the stock and spray-headunits together is hollow to provide a passage therethrough for the airto the spray-head, lthe air entering said tube through one or morepassages 44 in its rear end portion.

The valve chamber 41 is closed between its inlet and outlet passages bya check-valve 45, which has opening and closing movements in a planelongitudinally to the body of the stock and is normally held seated inclosed position by a coiled compression spring 46. An operating stem 47projects forwardly from the valve 45 through a suitable packing glandand without the forward side of the handle 3 in position to be engagedat its forward end by the trigger 9 and operated to.

'material valve 7 during the continued retracting movement of thetrigger. This permits compressed air to be admitted to the cylinder 19and also to the spray-head before the material valve 7 is opened topermit .a discharge of material from the spray-head The air pressureadmitted to the forward end of the cylinder 19 acts against the 15Cpiston 24 and moves it rearward against the tension of the spring 31,thereby entirely relieving the valve of the closing pressure of suchspring, the only pressure then acting on the valve to resist an openingthereof being that of the light pressure spring 37, which acts on thevalve stem through the pressure rod 35.

In practice, it is found desirable for most work to have a closingpressure of approximately eleven pounds against the valve when thetrigger is free, and this is divided between the springs 31 and 3'? sothat the former has a closing pressure of approximately eight pounds andthe latter of ap-" proximately three pounds. It is thus evident thatwhen the trigger is operated to open the air-control valve 45, the airpressure within the cylinder 19 acts to relieve the trigger, in thepresent -instance, of approximately eight poundsy of the valve-closingpressure normally employed, and to make it necessary for the operator toonly overcome a closing pressure of approximately three pounds inopening the material valve 'l and maintaining it open during a sprayingoperation. This effects a very material easing of the strain and effortheretofore necessary on the part of the operator to operate the triggerduring a spraying operation and/enables aconsiderably longer continueduse of the gun without tiringthe operator than would otherwise bepossible.

The details of construction of the control unit C, which include thespecic stop adjusting means shown for the valve 7, and particularly anadjustment of'such means without requiring axial movement of the controlmember 26, is not claimed herein, as such construction constitutes apart of the claimed subject-matter of a copending application of HaroldA. RoselundSerial No. 631,876 which has matured into Patent No.1,962,911 dated June 12, 1934, as does also the manner shown forconnecting the stock and spray-head units A and B. f

In Fig. 6 is illustrated a form of automatic pressure-relieving meansfor the material valve, wherein only one spring is employed and the airpressure is utilized to relieve only a portion of the tension of suchspring.

In this form of the invention, 50 represents the shell member of thecontrol unit, which is mounted in the stock bore 16 the same as in theother case, and 51 is the piston operating in the cylinder and havingthe stem 52 projecting from the forward end of the shell and bearingagainst the rear .end of the valve enlargement 12. The outer end of theshell is closed by a plug 53, which is threaded inthe shell and axiallyadjustable relative thereto. The valve-closing spring 54 bears at oneend against the piston 5l and at its other end against the plug 53,which is cupped to partially receive the spring. Air underpressure isadmitted from the bore 16 to the interior of the shell 50 in advance ofthe piston 51 through one or more ports 55. predetermined normaloperating pressure of the air, which may, for instance, be considered aseighty pounds, the area of the piston exposed to the air pressure is soproportioned that such maximum air pressure of eighty pounds actingthereagainst will obviate or counterbalance say eight pounds of thespring pressure, if the closing pressure of the spring is eleven pounds,thus leaving a three pound closing pressure of the spring to be overcomeby the operator through pressure applied to the trigger 9. 'I'he tensionof the spring 54 can bevaried by an adjustment of the plug 58 in theshell 50.

In this case, assuming anyr The form of automatic control rst describedis preferable to that shown in Fig. 6, for the reason that in the latterit is necessary to maintain the operating air pressure approximatelyconstant in order to maintain the automatic pressure-relieving featureof the control means approximately constant, whereas in the rst form theoperating air pressure may vary Within a wide range without effectingthe operation of the pneumatic control means, so long as the pressureacting against the piston 24 is suicient to overcome or balance that ofthe main closing spring 31.

It is apparent that to separate the stock and spray-head units of thegun for cleaning, inspection,Y or other purpose, it is only necessary toturn the tube 6 to release the threaded connection of its forward endwith the spray-head, after which the spray-head may be withdrawnforwardly from the stock, except that it is necessary during the initialforward movement of the spray-head to move the trigger 9 forwardlytherewith from normal position to eiect a throwing of the dog 1l torelease position with respect to the Valve stem enlargement 12, as shownin Fig. '1. When the spray-head is in attached relation to the stock,the rear end of the shank 5 of the former projects into position tocoact with and prevent a suicient forward movement of the trigger 9 tomove the dog 11 to released position.

It is also apparent that the valve 7 is normally acted on by the fulltension of both springs 31 and 37, or, as in the case of the form shownin Fig. 6, with the full tension of the spring 54, so as to insure a rmseating of the material valve to prevent escape of the material from thesprayhead. Upon a rearward movement of the trigger 9 to eiect a.spraying operation, the air valve 45 is rst opened, due to the lostmotion connection between the dog 11 and valve stem enlargement 12, thuspermitting air under pressure to enter the cylinder of the control unitC, where it acts on the enclosed piston to relieve, in one case, theentire closing pressure of the sprin'g 31 on the valve,l and in theother case al predetermined portion of the pressure of the spring 54. l'Ihe air also passes to and from the'spray-head. The.

continued rearward movement of the trigger effects further opening ofthe air valve and also a retraction of4 the material valve, the latteragainst the light pressure of the spring 37 or the remaining activepressure of the spring 54. It will be understood that theclosingpressure on the material valve during such continued movement ofthe trigger is only sufficient to cause the material valve to seat whenthe trigger pressure thereon is released.

We wish it understood that our invention is not limited to any specificconstruction, arrangement or form of the parts, as it is capable ofnumerous modifications and changes Without departing l air pressurecontrol valve, means acting on the material valve to exert a closingpressure thereon, means manually operable to open the air valve and alsothe material valve against the pressure of said means,'said closingmeans being automatically operable by air pressure, when the air valveis open, to counteract a portion of the closing pressure of the closingmeans.

3. In a spray gun, a normally closed air valve and a normally closedmaterial valve for the gun, spring pressure means acting on the materialvalve to exert a closing pressure thereon and including a cylinder andpiston at the outlet side of the air valve and in communication with thepassage controlled thereby, said piston lbeing operable by air pressure,when the air valve is open, to counteract a portion of the closingpressure of the closing means, and manually operable means for openingsaid valves.

4. In a spray gun, an air valve and a material valve for controlling therespective discharge of air and material from the spray gun, the airvalve being normally closed, a spring pressed plunger normally operableto exert a predetermined closing pressure on the material valve andlpneumatically operable by air pressure when the air valve is opened topartially relieve said closing pressure, and manually operable means toopen the air and material valves one in advance of the other.

5. In a spray gun, normally closed control valves respectively for theair and material discharge, a plunger exposed to the air dischargingpressure at the outlet side of said valve and having connection with thematerial valve, means yieldingly acting on said plunger to cause it toexert a predetermined closing pressure on the material valveI saidplunger being operated by air pressure, when the air valve is open, tocounterbalance a portion of the pressure of said yielding means againstthe plunger, Ameans manually operable to open rst said air valve andthen the material valve, and means for adjusting the tension of saidpressure means.

6. In a spray gun, normally closed control valves respectively for theair and material discharging from the gun, a plunger having closingcoaction with the material valve, a spring acting against said plungerto exert a predetermined valve-closing pressure thereon, said plungerbeing exposed at one side to the air discharging pressure when the airvalve is open and being automatically operable by such air pressure tocounteract a portion at least of the closing pressure of said spring,and means manually operable to open said air and material valves.

7. In a spray gun, normally closed control valves respectively for theaiL and material discharging from the gun, a plunger oacting with thematerial valve, a spring acting on the plunger to exert a predeterminedvalve-closing pressure thereon, said plunger being automatically actedon by air pressure,.when said air valve is open, to at least partiallycounteract the pressure of the spring thereon, a secondary pressuremeans exerting a seating inuence on the material valve, and meansmanually operable to open said air and material valves.

8. In a spray gun, a material control valve, two pressure means eachnormally exerting a closing pressure on said valve, one of said meansbeing automatically operable by uid pressure to counteract itsvalve-closing action, and manually operable means for opening saidvalve.

9. In a spray gun, amaterial control valve, two pressure means eachnormally exerting a closing pressure on said valve, one of said meansbeing automatically operable by air pressure to counteract thevalve-closing action thereof, and

-means manually operable to admit air under least partially thevalve-closing pressure of such stronger spring means, and means manuallyoperable to open said air and material valves.

11. In a spray gun, a stock body and a sprayhead, said body having alongitudinally extending bore therein, a control valve for the materialdischarge from the spray head having a stem extending rearwardly towardthe forward end of said bore, means manually operable to open saidvalve, and a control means for the valve mounted in and removable as aunit from said bore, said control means including a shell, aplunger'reciprocally movable in the shell and having a part coactingwith the valve to adapt it to impart closing movements thereto, andspring means acting on the plunger to cause it to exert a predeterminedclosing pressure on the valve, said plunger adapted to be acted on byiluid pressure to counteract the valve-closing action of the springthereon. r

12. In a spray gun, a stock body having a 1ongitudinally extending borein its rear portion and a spray head carried by said body, a valvecarried by the head for controlling the material discharge therefrom andhaving a stem projecting rearwardly toward the forward end of said bore,a trigger member for acting on the valve to move it to open position,and a closing control unit for the valve mounted in said bore andremovable bodily therefrom, said unit comprising a cylinder adapted tohave controlled communication at its forward end with a source or airpressure supply, two spring pressed members mounted in said unit andindependently operable toexert 'a closing pressure on the valve stem,one of said members being automatically operable by air pressure in thecylinder to counteract its valveclosing action. Y

13. In a spray gun, a reciprocally movable control valve having ashouldered part, a trigger, a dog carried by the trigger and operable toengage the valve shoulder and impart opening movements to the valve whenthe trigger has normal operating movements, and means coacting with saiddog to cause it to be moved out of operating alignment with the valveshoulder when the trigger is moved a predetermined extent from normaloperating position.

14. In a spray gun, a body part, a spray head removably carried by thebody part and including a reciprocally movable control valve having itsstem projecting rearwardly from the spray head and provided with ashoulder, a trigger movably carried by the body part, a dog pivotallycarried by the trigger and operable to engage the valve shoulder andimpart opening movements to the valve when the trigger is normallypredetermined extent from. normal operating po-` sition, whereby topermit a removal of the spray head from the body member.

15. In a spray gun, a body, a spray head detachably carried thereby andhaving a normally closed reciprocally movable control valve the stem ofwhich projects rearwardly from the spray head and is shouldered, atrigger movably carried by the body, a dog pivoted to the trigger andstraddling the valve stem when the triggerL is in normal operatingposition and adapted to coact with the stem shoulder to open the valvewhen the trigger is moved rearwardly from normal position, and meanscooperating with the dog to move it to disengaged position with respectto the valve stem when the trigger is moved ,forwardly from normalposition.

16. In a spray gun, a normally closed reciprocally movable materialcontrol valve having a shouldered stem, a trigger, a forked dog pivotedto the trigger and operable to engage the valve stem shoulder and openthe valve when the trig ger is moved rearwardly from normal position,and means coacting with the dog to move it relative to the trigger toinoperative position relative to the Valve when the trigger is movedforward from normal position.

l'. In a spray gun, a body, a spray head removably carried by the bodyand having a control valve with its stem projecting rearwardly from thehead and shouldered, means acting to normally close the valve, a triggerpivoted to the body, and a dog of U-form pivoted at its leg portions tothe trigger and having its web portion notched to straddle the valvestem and to coact with the stem shoulder to openthe valve when thetrigger is moved rearwardly from normal position, said dog and bodyhaving camming coaction to eiect movement of the dog to releasedposition with respect to the valve stem when the trigger is movedforward from normal position.

18. In a spray gun, a valve for the control o! the material discharge, acontrol unit for the valve separable therefrom and mountedinv and bodilyremovable as a unit from the gun and including a movable member springactuated in one direction to have closing coaction with the .valve andpneumatically operated in the opposite direction to relieve, apredetermined'extent, the spring actuated valve closing pressure of themember, and means separate from said unit and coacting with and manuallyoperable to open` the valve.

19. In a spray gun, a normally closed reciprocally movable valve, atrigger, means movably the trigger is moved forwardly a predetermined yextent from normal operating position.l

20. In a spray gun, a normally closed control valve, manually operablecontrol means for the v alve, means pivotally carried by said controlmeans. and actuated by valve opening movements of said control means toimpart opening movements to the valve, and cam means for movingsaidpivotal means to disengage ,the valve upon a predetermined abnormalmovement of the control means.

2l. In a material discharge gun, a material valve, means acting on saidvalve to exert a predetermined closing pressure thereon, means manuallyoperable to open the valve against said closing pressure, and meansrendered operable by a predeterminedvalve opening movement of ,saidmanually operable means to counteract a portion of the closing pressureof said rst means.

22. In a material discharge gun, a material valve, means acting on saidvalve to exert a predetermined closing pressure thereon, means manuallyoperable to open the valve against saidclos-I ing pressure, meansoperable to counteract a'portion of the closing pressure of said firstmeans, and means actuated by a valve opening movement of said manuallyoperable means torender said last means active.

23. In a spray-gun, a material 'control valve, two pressure means eachnormally exerting a closing pressure on said valve, means operable toopen the valve against said closing pressure,

and means rendered operable by a predetermined valve opening movement ofsaid operating means to counteract a portion of the valve closingpressure of said pressure means.

24. In a material discharge gun, a material DISCLAIMER1,969,205r-W'illiam P. Garr and Robert W.

Tracy, Toledo, Ohio. MATERIAL Dls-v Hcreby enter this disclaimer tolclaims l [Oc'ial VGazette March 1?', 1.936.]

, 2, 3, 4, 5, 6, 21, and 22 ofsaid patent.

sition, whereby to permit a removal of the spray head from the bodymember.

15. In a spray gun, a body, a spray head detachably carried thereby andhaving a normally closed reciprocally movable control valve the stem ofwhich projects rearwardly from the spray head and is shouldered, atrigger movably carried by the body, a dog pivoted to the trigger andstraddling the valve stem when the triggerL is in normal operatingposition and adapted to coact with the stem shoulder to open the valvewhen the trigger is moved rearwardly from normal position, and meanscooperating with the dog to move it to disengaged position with respectto the valve stem when the trigger is moved ,forwardly from normalposition.

16. In a spray gun, a normally closed reciprocally movable materialcontrol valve having a shouldered stem, a trigger, a forked dog pivotedto the trigger and operable to engage the valve stem shoulder and openthe valve when the trig ger is moved rearwardly from normal position,and means coacting with the dog to move it relative to the trigger toinoperative position relative to the Valve when the trigger is movedforward from normal position.

l'. In a spray gun, a body, a spray head removably carried by the bodyand having a control valve with its stem projecting rearwardly from thehead and shouldered, means acting to normally close the valve, a triggerpivoted to the body, and a dog of U-form pivoted at its leg portions tothe trigger and having its web portion notched to straddle the valvestem and to coact 35 with the stem shoulder to openthe valve when thetrigger is moved rearwardly from normal position, said dog and bodyhaving camming coaction to eiect movement of the dog to releasedposition with respect to the valve stem when the trigger is movedforward from normal position.

18. In a spray gun, a valve for the control o! the material discharge, acontrol unit for the valve separable therefrom and mountedinv and bodilyremovable as a unit from the gun and including a movable member springactuated in one direction to have closing coaction with the .valve andpneumatically operated in the opposite direction to relieve, apredetermined'extent, the spring actuated valve closing pressure of themember, and means separate from said unit and coacting with and manuallyoperable to open` the valve.

19. In a spray gun, a normally closed reciprocally movable valve, atrigger, means movably carried by the trigger and operable to coact withthe valve and impart opening movements thereto when the trigger isvnormally operated,y and means coacting with said irst means to move itrelative to the trigger to release the valve when the trigger is movedforwardly a predetermined y extent from normal operating position.l

20. In a spray gun, a normally closed control valve, manually operablecontrol means for the v alve, means pivotally carried by said controlmeans. and actuated by valve opening movements of said control means toimpart opening movements to the valve, and cam means for movingsaidpivotal means to disengage ,the valve upon a predetermined abnormalmovement of the control means.

2l. In a material discharge gun, a material valve, means acting on saidvalve to exert a predetermined closing pressure thereon, means manuallyoperable to open the valve against said closing pressure, and meansrendered operable by a predeterminedvalve opening movement of ,saidmanually operable means to counteract a portion of the closing pressureof said rst means.

22. In a material discharge gun, a material valve, means acting on saidvalve to exert a predetermined closing pressure thereon, means manuallyoperable to open the valve against saidclos-I ing pressure, meansoperable to counteract a'portion of the closing pressure of said firstmeans, and means actuated by a valve opening movement of said manuallyoperable means torender said last means active.

23. In a spray-gun, a material 'control valve, 110 two pressure meanseach normally exerting a closing pressure on said valve, means operableto open the valve against said closing pressure, and means renderedoperable by a predetermined valve opening movement of said operatingmeans 115 to counteract a portion of the valve closing pressure of saidpressure means.

24. In a material discharge gun, a material control valve, two prsuremeans each normally exerting a closing pressure on said valve, means 120manually operable to open the valve against said closing pressure, meansoperable to counteract a predetermined portion of the closing pressureof said nrst means, and means actuated by a valve opening movement ofsaid manually operable 125 means to render said last means active.

WILLIAM P. CARR. ROBERT W. TRACY.

DISCLAIMER 1,969,205r-W'illiam P. Garr and Robert W.

CHARGE GUN. Patent dated August 7, 1934. Disclaimer filed February 29,1936, by the patentees, the assignee, The De Vilbiss Company, approving.

Hereby enter this disclaimer to lclaims l [Omal VGazette March 1?',1.936.]

Tracy, Toledo, Ohio. MATERIAL Dls-v 2, 3, 4, 5, 6, 21, and 22 ofsaidpatent.

